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Explanation of how the Acquire Mode External works in the different
Trigger Modes (see 6.3.1):
If set to External, the camera only records images if the external
signal enables recording.
The Acquire Mode is level controlled. That means at the level "high"
image acquisition is possible, at the level "low" not (or inverted).
A practical example would be an illumination of the experiment which
generates a signal and is coupled to the Acquire Enable input: light
on means level "high" and thus image acquisition, light off level "low"
and no image acquisition.
In Trigger Mode Auto Sequence the sensor timing scheme (image
acquisition of the sensor) is paused by the signal at the Acquire
Enable input SMA #2. The Acquire Enable input is sampled at the
beginning of the image generation, shown by the rising edge of the
Status Expos output SMA #4.
Image acquisition is on an idle state if the Acquire Enable input is on
low level (high, when inverted); it pauses image acquisition until the
Acquire Enable input is on high level again (high, when inverted).
In Trigger Mode External Exposuse Start, the Acquire Enable
input SMA #2 works like a gate for the trigger signal.
The rising edge of the trigger (falling when Exposure Trigger is
inverted) is accepted only when the Acquire Enable signal is high
level (low, when inverted).
Status Expos signal see chapter 6.3.7 for Signal Timing First Line.
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